Telephone base unit



FIG. 1 is a front, top and right side perspective view of a telephone base unit showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is the rear elevational view thereof;

FIG. 4 is the left side view thereof;

FIG. 5 is the right side view thereof;

FIG. 6 is the top plan view thereof; and,

FIG. 7 is the bottom view thereof. 

The ornamental design for a telephone base unit, as shown and described. 